<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="黑马头条">
      <van-icon name="arrow-left" slot="left" @click="$router.go(-1)" />
    </van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="isLoading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="articleList.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{articleList.title}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="articleList.aut_photo" />
          <div slot="title" class="user-name">{{articleList.aut_name}}</div>
          <div slot="label" class="publish-date">{{articleList.pubdate | formatDate}}</div>
          <!-- <UserFollow @updateFollow="articleList.is_followed=$event" :isFollowed="articleList.is_followed"
            :autId="articleList.aut_id" /> -->
          <UserFollow v-model="articleList.is_followed" :autId="articleList.aut_id" />
          <!-- v-model：可以在表单上使用，也可以在组件上使用 -->
          <!-- 什么时候用：既要传数据，子组件还要该数据 -->
          <!--怎么用：v-model="要传递的数据"
            v-model解析 做了两件事，解析两个
            1. 一个属性  :value="articleList.is_followed" 传递给子组件一个value
            2.一个事件  @input="articleList.is_followed=$event"
           -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content" ref="content" v-html="articleList.content"></div>
        <van-divider>正文结束</van-divider>
        <!-- 文章评论 -->
        <ArticleComments @replayComment="replayClick" :list="list" :source="articleList.art_id"
          @totalCount="badge=$event" />
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="is404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button @click="getUserArtical" class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 底部区域 -->
    <div v-if="articleList.title" class="article-bottom">
      <van-button class="comment-btn" type="default" round size="small" @click="showCommentPopup=true">写评论</van-button>
      <van-icon name="comment-o" :badge="badge" color="#777" />
      <!-- 收藏 -->
      <UserCollect :collectId="articleList.art_id" v-model="articleList.is_collected" />
      <!-- 点赞 -->
      <ArticleGood :articleId="articleList.art_id" v-model="articleList.attitude" />
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->

    <!-- 评论弹出层 -->
    <van-popup v-model="showCommentPopup" position="bottom">
      <CommentPopup :target='articleId' @onPutSuccess="onPutSuccess" />
    </van-popup>

    <!-- 回复弹出层 -->
    <van-popup v-model="showReplayComment" style="height:100%" position="bottom">
      <ReplayComment v-if="showReplayComment" :comment="comment" @close-replay="showReplayComment=false" />
    </van-popup>
  </div>
</template>

<script>
import { getArticalInfo } from '@/api/artical.js'
import { ImagePreview } from 'vant'
import UserFollow from '@/components/user-follow.vue'
import UserCollect from './components/article-collect.vue'
import ArticleComments from './components/article-comments.vue'
import ArticleGood from './components/article-good.vue'
import CommentPopup from './components/comment-popup.vue'
import ReplayComment from './components/replay-comment.vue'
export default {
  name: 'ArticleIndex',
  data () {
    return {
      // 文章详情信息
      articleList: [],
      isLoading: false,
      is404: false,
      badge: 0,
      // 发布评论弹出层
      showCommentPopup: false,
      // 文章评论列表数据
      list: [],
      // 对评论回复的弹出层
      showReplayComment: false,
      // 文章评论数据
      comment: {}
    }
  },
  props: {
    // 通过路由传参
    articleId: {
      type: String,
      required: true
    }
  },
  methods: {
    // 添加评论的评论
    replayClick (e) {
      this.showReplayComment = true
      // console.log(e)
      this.comment = e
    },
    // 添加文章评论
    onPutSuccess (e) {
      this.list.unshift(e)
      this.showCommentPopup = false
    },
    // 获取文章详情
    async getUserArtical () {
      this.isLoading = true
      try {
        const res = await getArticalInfo(this.articleId)
        // console.log(res)
        this.articleList = res.data.data
        this.isLoading = false
        this.$nextTick(() => {
          this.previewImg()
        })
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.is404 = true
        }
        this.$toast('获取文章详情失败')
        this.isLoading = false
      }
    },
    // 图片预览
    previewImg () {
      // console.log(this.$refs.content)
      const imgs = this.$refs.content.querySelectorAll('img')
      const imags = []
      imgs.forEach((item, index) => {
        imags.push(item.src)
        item.onclick = function () {
          ImagePreview({
            images: imags,
            startPosition: index
          })
        }
      })
    }

  },
  computed: {},
  watch: {},
  filters: {},
  components: {
    UserFollow,
    UserCollect,
    ArticleComments,
    ArticleGood,
    CommentPopup,
    ReplayComment
  },
  created () {
    this.getUserArtical()
  },
  mounted () { }
}
</script>

<style scoped lang="less">
/deep/.van-button--normal {
  padding: 0;
}
.article-container {
  .van-icon-arrow-left {
    color: #fff;
  }
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
